To ride a horse around standing barrels in a race.

A ventilated covering for the barrel of a firearm that prevents accidental burns to the operators

One who barrel races.

plural of barrel racer

plural of barrel roof

plural of barrel vault

(architecture) A simple roof having a curved, often semicircular cross section; used to span large distances in railway stations, churches, etc. Usually supported on columns.

plural of barrel organ

plural of Damascus barrel

(idiomatic) In a disadvantageous or helpless situation, especially one in which one may be controlled or victimized.